"How do I add Office 2010 Professional Plus to my MDT 2010 Update 1 Beta environment?"
"Well, the most of it's documented in help files of MDT 2010. The first step is to get MDT 2010 Update 1 Beta from Microsoft Connect. If the link doesn't work for you, you may need to create an account first. MDT 2010 Update 1 is in "Solution Accelerators" program. There's a "Security Solution Accelerators" program, too, with great content. Once you're in there, you can download MDT 2010 Update 1 in both x64 and x86 versions, or print-ready documentation."
Office Customization Tool (OCT) helps you customize which components and features of Office are configured upon installation. You can create role specific MSP packages to customize your app to meet your specific user group needs. For e.g., I can give Finance roles Excel, PowerPoint and Word, marketing roles just PowerPoint and Word, and sales roles Access, PowerPoint and Word. MSP files you generate are automatically stored in Updates folder of Office source directory. Finally, learn more about Office 2010 activation.
More Info: Documentation